Travis and Theo face danger while responding to an emergency at a haunted house. Ben continues his fight for Baby Pru; Vic opens up to Andy; and Station 19 prepares to welcome patients to the Dean Miller Memorial Clinic.

London, four months after the attack. The survivors organize the Resistance. Bill continues his research on aliens and understands that their DNA is human but that their organs are degenerating. In France, a severely wounded dissident alien reaches the Observatory

At the Observatory, Mokrani and Catherine clash over the fate to be reserved for Micah, whom Catherine considers to be a major source of information. Micah reveals to Catherine that she has to find Bill Ward. The latter, for his part, tries to find out more about Emily, still assailed by visions of Adina, the leader of the aliens urging him to kill Bill.

Oh no! The Red Goobler's back and this time he's jacked! This one's too scary for me.

One year after escaping the destruction of their planet Shlorp and crashing on Earth, aliens Korvo, Terry, and their child-replicants Yumyulack and Jesse adjust to their new lives. Korvo is determined to repair their spaceship, but Terry introduces him to the television show Funbucket. Realizing that the titular alien is fictional, they create a real Funbucket, who tires of them and befriends humans Travis and Avery. Forced to attend high school, Yumyulack and Jesse are menaced by their classmates and faculty. They shrink a bully named Lydia, hoping to use her to study human behavior. As the Shlorpian family have dinner together, it is revealed that their pet, the Pupa, will one day evolve and destroy Earth to terraform a new Shlorp.

M.O.D.O.K brings Melissa and Lou along to a remote GRUMBL leadership conference. After learning that he's not the guest of honor, M.O.D.O.K. enlists Melissa's help in manipulating the executives into respecting him. His schemes accidentally lead to him opening up a portal that brings the dangerously hedonistic alien species, the Ciegrimites, to the conference. While the aliens are initially the life of the party, executives begin to drop dead from partying too hard, leading M.O.D.O.K. and Melissa to wipe out the Ciegrimites and save the conference.

A deadly face-off leads to a life-threatening moment; Catherine and Sam seek help for his parents.

Amelia and Simone attempt to perform a high-stakes and groundbreaking brain surgery; Teddy and Bailey attend a medical conference and run into Dr. Cass Beckman; Jo struggles with her irritation toward a younger OB-GYN.

Bailey welcomes a renowned surgeon, whom she greatly admires, to Grey Sloan to help on a challenging case; Teddy, Owen, Jules and Ben team up to save the life of a patient who has been impaled by an ice pick.

Lynette tries to put a daycare center in Parcher & Murphy by recruiting employees' children to get the program started. Gabrielle and Sister Mary Bernard face off over Carlos' mission of mercy to Africa. Bree brings Andrew home and tells him about the revelation of George poisoning his father Rex and killing him. Lastly, Susan confronts her biological father's wife after she thinks they are having an affair.

Gabrielle kisses Tom and Lynette is not happy and drives a wedge in her friendship with Gabrielle. Paul attacks Mike. The housewives become more suspicious of Betty and her family. Andrew is trying to blackmail Bree, but Bree gets some assistance from Susan's ex, Karl.

When patients from the hospital's prescription drug trial start suffering life threatening side effects, Nic fears that her sister Jessie may be in danger. As a result, she and Conrad work to convince Bell that these trials are not worth the risk. Meanwhile, Mina, Austin and Kit must set aside their competitive nature and work together on a patient whose health is quickly deteriorating and Devon uses Julian as the beta tester for a product he's designed.

Amelia and Simone attempt to perform a high-stakes and groundbreaking brain surgery; Teddy and Bailey attend a medical conference and run into Dr. Cass Beckman; Jo struggles with her irritation toward a younger OB-GYN.

Bailey welcomes a renowned surgeon, whom she greatly admires, to Grey Sloan to help on a challenging case; Teddy, Owen, Jules and Ben team up to save the life of a patient who has been impaled by an ice pick.

Lynette tries to put a daycare center in Parcher & Murphy by recruiting employees' children to get the program started. Gabrielle and Sister Mary Bernard face off over Carlos' mission of mercy to Africa. Bree brings Andrew home and tells him about the revelation of George poisoning his father Rex and killing him. Lastly, Susan confronts her biological father's wife after she thinks they are having an affair.

Gabrielle kisses Tom and Lynette is not happy and drives a wedge in her friendship with Gabrielle. Paul attacks Mike. The housewives become more suspicious of Betty and her family. Andrew is trying to blackmail Bree, but Bree gets some assistance from Susan's ex, Karl.

An anonymous tip to the LAPD sparks an unusual multiple-victim kidnapping investigation, forcing the team to rely on board games and puzzles to track down their suspect.

Conrad goes head-to-head with Bell after he recommends one of Julian's risky medical devices to Zoey, who's already lost one son and is back in the hospital with the other. Nic fears that Conrad may be getting overly attached to his patient. Meanwhile, Mina and Austin grow closer while working on a difficult heart transplant, Devon embarks on a very difficult day and Dr. Lane Hunter returns.

A window washer's platform crashes through a hospital window, testing the Grey Sloan team's limits; Blue and Simone clash over their living arrangements; Lucas strives to impress Catherine while on her service.

Amelia undertakes a high-risk brain surgery on a young patient; Winston and Jules disagree over how to handle their trauma patient's family; Jo and Link struggle with wedding planning.

After a number of bad dates, Susan finally meets Dr. Right. Susan flirts with a handsome doctor, but they accidentally head butt. Meanwhile, some old pictures of Gabrielle turn up on the Internet. Tom is alarmed when his kids come down with chicken pox because he never had it. Bree gets arrested. Lastly, after months of silence, Noah Taylor contacts Mike Delfino.

Dr. Ron informs Susan that she needs a splenectomy. Gabrielle and her arch-enemy Sister Mary Bernard finally face off in church. Also, Tom decides to apply for an empty position at Lynette's job, which leads to the arousal of past issues in their marriage. Lastly, Matthew and Danielle's relationship is found out by both their mothers, which leads to big repercussions later on for Bree and her past secret with Andrew last year.

Travis and Theo face danger while responding to an emergency at a haunted house. Ben continues his fight for Baby Pru; Vic opens up to Andy; and Station 19 prepares to welcome patients to the Dean Miller Memorial Clinic.

Peter stumbles upon a house fire in progress before the fire department arrives and is able to rescue a young woman. When Megan goes to the scene of the fire, she discovers that there is another victim who perished in the fire.

A man, presumed dead, who walks off Ethan's examination table leads the team to a shocking discovery.

An anonymous tip to the LAPD sparks an unusual multiple-victim kidnapping investigation, forcing the team to rely on board games and puzzles to track down their suspect.

When Max's transmission goes silent, he and Barry seek refuge in an abandoned church while Tristan takes charge of The Odyssey; Avery leads a high-stakes, rescue mission to find Max.

Peter stumbles upon a house fire in progress before the fire department arrives and is able to rescue a young woman. When Megan goes to the scene of the fire, she discovers that there is another victim who perished in the fire.

An anonymous tip to the LAPD sparks an unusual multiple-victim kidnapping investigation, forcing the team to rely on board games and puzzles to track down their suspect.

Travis and Theo face danger while responding to an emergency at a haunted house. Ben continues his fight for Baby Pru; Vic opens up to Andy; and Station 19 prepares to welcome patients to the Dean Miller Memorial Clinic.

After a number of bad dates, Susan finally meets Dr. Right. Susan flirts with a handsome doctor, but they accidentally head butt. Meanwhile, some old pictures of Gabrielle turn up on the Internet. Tom is alarmed when his kids come down with chicken pox because he never had it. Bree gets arrested. Lastly, after months of silence, Noah Taylor contacts Mike Delfino.

Edie thinks that Karl is going to pop the question after she finds an engagement ring and prenuptial agreement in his briefcase. Also, Gabrielle and Carlos learn she is highly unable to conceive a child again because of complications caused from her recent miscarriage. Lastly, Bree's problem with alcohol intensifies with the notice of Lynette after Bree babysits her children.

Jo and Link's wedding day arrives, along with some visitors; Teddy and Owen are met with a familiar face seeking treatment; Lucas disagrees with Simone on how to approach a patient's worsened condition.

The interns are excited to transition to second-year residency; a medical emergency unfolds in the operating room, endangering lives inside the hospital.

Devon's doubts about his relationship reach a peak as his friends and family gather for his big wedding day. As Chastain's leading medical device company, Quovadis, continues to succeed, Julian (guest star Jenna Dewan) makes a discovery that leaves her uneasy about her involvement in it all. Meanwhile, Conrad continues to work on his relationship with Marshall and Bell takes a risky offer in order to make a mistake from his past disappear.